<template>
	<transition name="list-fade">
		<div class="playlist" v-show="showFlag" @click="hide">
			<div class="list-wrapper" @click.stop>
				<div class="list-header">
					<h1 class="title"></h1>
					<span class="text"></span>
					<span class="clear" @click="showConfirm">
						<i class="icon-clear"></i>
					</span>
				</div>
				<scroll
					ref="listContent"
					:data="sequenceList"
					:refreshDelay="refreshDelay"
					class="list-content"
				>
					<transition-group name="list" tag="ul">
						<li
							ref="listItem"
							v-for="(item, index) in sequenceList"
							:key="item.id"
							class="item"
							@click="selectItem(item, index)"
						>
							<i class="current" :class="getCurrentIcon(item)"></i>
							<span class="text" v-text="item.name"></span>
							<span class="like" @click.stop="toggleFavorite(item)">
								<i :class="getFavoriteIcon(item)"></i>
							</span>
							<span class="delete" @click.stop="deleteOne(item)">
								<i class="icon-delete"></i>
							</span>
						</li>
					</transition-group>
				</scroll>
				<div class="list-operate">
					<div class="add" @click="addSong">
						<i class="icon-add"></i>
						<span class="text">添加歌曲到队列</span>
					</div>
				</div>
				<div class="list-close" @click="hide">
					<span>关闭</span>
				</div>
			</div>
			<confirm
				ref="confirm"
				text="是否清空播放列表"
				confirmBtnText="清空"
				@confirm="confirmClear"
			></confirm>
			<add-song ref="addSong"></add-song>
		</div>
	</transition>
</template>

<script>
	import Scroll from '@/base/scroll/scroll';
	import Confirm from '@/base/confirm/confirm';
	import AddSong from '@/components/add-song/add-song';
	import { playMode } from '@/common/js/config';
	import { playerMixin } from '@/common/js/mixin';
	import { mapMutations, mapActions } from 'vuex';

	export default {
		name: 'PlayList',
		mixins: [playerMixin],
		data() {
			return {
				showFlag: false,
				refreshDelay: 100
			}
		},
		methods: {
			show() {
				this.showFlag = true;
				setTimeout(() => {
					this.$refs.listContent.refresh();
					this.scrollToCurrent(this.currentSong);
				}, 20);
			},
			hide() {
				this.showFlag = false;
			},
			getCurrentIcon(item) {
				if (this.currentSong.id === item.id) {
					return 'icon-play';
				}
				return '';
			},
			selectItem(item, index) {
				if (this.mode === playMode.random) {
					index = this.playlist.findIndex(song => {
						return song.id === item.id;
					});
				}
				this.setCurrentIndex(index);
				this.setCurrentSong(this.playlist[index]);
				this.setPlayingState(true);
			},
			scrollToCurrent(current) {
				const index = this.sequenceList.findIndex(song => {
					return current.id === song.id;
				});
				this.$refs.listContent.scrollToElement(this.$refs.listItem[index], 300);
			},
			deleteOne(item) {
				this.deleteSong(item);
				if (!this.playlist.length) {
					this.hide();
				}
			},
			showConfirm() {
				this.$refs.confirm.show();
			},
			confirmClear() {
				this.clearSongList();
			},
			addSong() {
				this.$refs.addSong.show();
			},
			...mapMutations({
				setCurrentSong: 'SET_CURRENT_SONG'
			}),
			...mapActions(['deleteSong', 'clearSongList'])
		},
		watch: {
			currentSong(newSong, oldSong) {
				if (!this.showFlag || newSong.id === oldSong.id) return;
				this.scrollToCurrent(newSong);
			}
		},
		components: {
			Scroll,
			Confirm,
			AddSong
		}
	}
</script>

<style lang="stylus" scoped>
	@import "../../common/stylus/variable"
	@import "../../common/stylus/mixin"
	
	.playlist
		position: fixed
		left: 0
		right: 0
		top: 0
		bottom: 0
		z-index: 200
		background-color: $color-background-d
		&.list-fade-enter-active, &.list-fade-leave-active
			transition: opacity 0.3s
			.list-wrapper
				transition: all 0.3s
		&.list-fade-enter, &.list-fade-leave-to
			opacity: 0
			.list-wrapper
				transform: translate3d(0, 100%, 0)
		&.list-fade-enter, .list-wrapper
			position: absolute
			left: 0
			bottom: 0
			width: 100%
			background-color: $color-highlight-background
			.list-header
				position: relative
				padding: 20px 30px 10px 20px
				text-align: right
				.title
					display: flex
					align-items: center
					.icon
						margin-right: 10px
						font-size: 30px
						color: $color-theme-d
					.text
						flex: 1
						font-size: $font-size-medium
						color: $color-text-l
					.clear
						extend-click()
						.icon-clear
							font-size: $font-size-medium
							color: $color-text-d
			.list-content
				max-height: 240px
				overflow: hidden
				.item
					display: flex
					align-items: center
					height: 40px
					padding: 0 30px 0 20px
					overflow: hidden
					&.list-enter-active, &.list-leave-active
						transition: all 0.1s
					&.list-enter, &.list-leave-to
						height: 0
					.current
						flex: 0 0 20px
						width: 20px
						font-size: $font-size-small
						color: $color-theme-d
					.text
						flex 1
						no-wrap()
						font-size: $font-size-medium
						color: $color-text-d
					.like
						extend-click()
						margin-right: 15px
						font-size: $font-size-small
						color: $color-theme
						.icon-favorite
							color: $color-sub-theme
					.delete
						extend-click()
						font-size: $font-size-small
						color: $color-theme	
			.list-operate
				width: 140px
				margin: 20px auto 30px auto
				.add
					display: flex
					align-items: center
					padding: 8px 16px
					border: 1px solid $color-text-l
					border-radius: 100px
					color: $color-text-l
					.icon-add
						margin-right: 5px
						font-size: $font-size-small-s
					.text
						font-size: $font-size-small
			.list-close
				text-align: center
				line-height: 50px
				background: $color-background
				font-size: $font-size-medium-x
				color: $color-text-l
</style>